Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
345/35r19 vs 390/40r17 Tire Comparison Side By Side
  345/35-19 390/40-17 Difference
Diameter inches (mm) 28.51 (724.1) 29.28 (743.8) 0.78 (19.7) 2.7%
Width inches (mm) 13.58 (345) 15.35 (390) 1.77 (45) 13%
Circum. inches (mm) 89.56 (2274.83) 92 (2336.72) 2.44 (61.89) 2.7%
Sidewall Height inches (mm) 4.75 (120.75) 6.14 (156) 1.39 (35.25) 29.2%
Revolutions per mile (km) 707.46 (439.59) 688.72 (427.95) -18.74 (-11.64) -2.6%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.54 mph (33.06 km/h)
25 mph (40.23 km/h)25.68 mph (41.33 km/h)
30 mph (48.28 km/h)30.82 mph (49.59 km/h)
35 mph (56.33 km/h)35.95 mph (57.86 km/h)
40 mph (64.37 km/h)41.09 mph (66.13 km/h)
45 mph (72.42 km/h)46.22 mph (74.39 km/h)
50 mph (80.47 km/h)51.36 mph (82.66 km/h)
55 mph (88.51 km/h)56.5 mph (90.92 km/h)
60 mph (96.56 km/h)61.63 mph (99.19 km/h)
65 mph (104.61 km/h)66.77 mph (107.45 km/h)
70 mph (112.65 km/h)71.9 mph (115.72 km/h)
75 mph (120.7 km/h)77.04 mph (123.98 km/h)
80 mph (128.75 km/h)82.18 mph (132.25 km/h)
85 mph (136.79 km/h)87.31 mph (140.52 km/h)
90 mph (144.84 km/h)92.45 mph (148.78 km/h)
95 mph (152.89 km/h)97.58 mph (157.05 km/h)
100 mph (160.93 km/h)102.72 mph (165.31 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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